echarts 怎么让饼图的label只显示指定数据

{

            name:'访问来源',

            type:'pie',

            selectedMode: 'single',

            radius: [0, '30%'],

            label: {

                normal: {

                    position: 'inner',

                    show:false,

                }

            },

            labelLine: {

                normal: {

                    show: false

                }

            },

            data:[

                {value:335, name:'直达', selected:true,label: {show: true, fontSize: '8',  fontWeight: 'bold'}},

                {value:679, name:'营销广告'},

                {value:1548, name:'搜索引擎'}

            ]

        }